Note 2 - Mergers/Acquisitions/Sales (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Apr. 01, 2022 USD ($) item $ / shares shares	Mar. 31, 2022 USD ($) $ / shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Business Combination, Consideration Transferred			$ 144,085
Prepaid of FHLB advances			16,000		$ 55,274
Business acquisition related costs			3,715	$ 624
Premises and equipment, net			16,257
Proceeds from sales of securities			111,375	$ 23,874	$ 38,562
Core deposit intangible			10,264
Guaranty Federal Bancshares, Inc
Business Acquisition [Line Items]
Business combination consideration in cash (per share) | $ / shares	$ 30.50
Business acquisition, equity interest issued or issuable, number of shares | shares	0.58775
Business combination mixed consideration in cash (per share) | $ / shares	$ 6.10
Business combination shares issuable mixed consideration | shares	0.4702
Business acquisition, share price | $ / shares		$ 56.59
Business combination, stock consideration		$ 117,200
Business Combination, Consideration Transferred	$ 144,085	$ 26,900
Prepaid of FHLB advances			16,000
Business acquisition related costs			3,700
Post-acquisition, compensation, transition and integration costs			$ 5,500
Premises and equipment, net	16,257
Accretable discount of non-PCD loans	12,000
Provision for non-PCD loans acquired.	11,000
Proceeds from sales of securities	$ 111,400
Number of branch locations acquired | item	16
Useful life	39 years
Core deposit intangible	$ 10,264
Estimated useful life of deposits	10 years